Malicious PDF — malware analysis report

Static analysis result for SHA-256 16105bb98fc56ae5…

MALICIOUS

PDF

84.7 KB Created: 2021-03-17 07:13:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 72218d9e2c04e9024d81bc0def4b1290 SHA-1: ee8f5770ba2dfef4479d12af8d0435b512e4d155 SHA-256: 16105bb98fc56ae583af4db52a15648c057e37823cc2461584ef120532e6cc9d
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document is classified as malicious and exhibits characteristics of a phishing lure. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a fake browser extension or update, a common tactic for credential theft or malware installation. The embedded URLs and the overall structure strongly suggest a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/strik?utm_term=walmart+tvs+for+sale+32+inch PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491433/normal_60175b3a4ce65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382208/normal_603e830843ff3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368246/normal_5fefab11bf78d.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/dijjdhd/41126963072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490252/normal_601ff55e2afbe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416671/normal_5fe0f0c06937b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426550/normal_60411f88e26fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403688/normal_5fe701e7d6696.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/2bifc8w/free_printable_color_worksheets_for_toddlers.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/jW95igc/train_taxi_apk_hack.pdfIn PDF document text
    • https://lidafuxabu.weebly.com/uploads/1/3/4/8/134891514/6536731.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477864/normal_5ff5271ba3d22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405929/normal_5ff9b646c636c.pdfIn PDF document text
    • https://cdn.sqhk.co/jasamomedam/Q2zicMy/go_karts_houston_near_me.pdfIn PDF document text
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/futekawus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414339/normal_6032bc2adf31c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wutodabegaf.epizy.com/laser_cuttable_magnet_sheet.pdfIn PDF document text
    • http://relogevavikidid.epizy.com/nomowuxelilezogafu.pdfIn PDF document text
    • http://lurebilowate.rf.gd/74292577878.pdfIn PDF document text
    • http://tunijerizimajej.epizy.com/how_does_petsafe_wireless_pet_containment_system_work.pdfIn PDF document text
    • http://muzififezi.rf.gd/mathematical_expectation_probability.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 5276 bytes
SHA-256: 2f0cbdba6b53ab693f9c31c166638387ea8516bbfdac9c9e40d5a8fcb8b2b07f
font_01_sfnt_off00011240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11240 10908 bytes
SHA-256: 408fd9541213f2ac8aef4151c61bc3d93f6957bbd5ad68e320bf92b9453c2886
font_02_sfnt_off0001375d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2